EP3026282B1 - Dispositif d'étanchéité avec un codeur pour un ensemble de roulement d'un moyeu de roue relié à un joint homocinétique - Google Patents

Dispositif d'étanchéité avec un codeur pour un ensemble de roulement d'un moyeu de roue relié à un joint homocinétique Download PDF

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Publication number
EP3026282B1
EP3026282B1 EP15191531.1A EP15191531A EP3026282B1 EP 3026282 B1 EP3026282 B1 EP 3026282B1 EP 15191531 A EP15191531 A EP 15191531A EP 3026282 B1 EP3026282 B1 EP 3026282B1
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EP
European Patent Office
Prior art keywords
annular
shield
radially
journalling
constant velocity
Prior art date
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Active
Application number
EP15191531.1A
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German (de)
English (en)
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EP3026282A1 (fr
Inventor
Daniele Duch
Fausto Morello
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SKF AB
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SKF AB
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0073—Hubs characterised by sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/768—Sealings of ball or roller bearings between relatively stationary parts, i.e. static seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0047—Hubs characterised by functional integration of other elements
    • B60B27/0068—Hubs characterised by functional integration of other elements the element being a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Definitions

  • the present invention relates to a low friction sealing device for wheel hub assemblies connected to constant velocity joints provided with a signal generating element and having in addition to a low-friction operation, a simplified structure, an improved sealing action and an improved magnetic signal.
  • the wheel hub assemblies support on one side a vehicle wheel and, in the case of a driving wheel, are angularly connected to a respective constant velocity joint for the transmission of the driving torque from the drive shaft to the wheel itself.
  • the wheel hub assemblies have an axis of rotation and comprise an inner ring and an outer ring coaxial to each other and to the axis of rotation and rotatable one with respect to the other by the interposition of two rows of rolling bodies.
  • the inner ring is a flanged inner ring to allow the attachment of a wheel to the assembly, and comprises:
  • the transmission of the driving torque by the constant velocity joint to the wheel hub assembly is ensured by conjugated toothed means for motion transmission provided on the adjacent and facing ends of the wheel hub and of the constant velocity joint outer ring;
  • the toothed means can be constituted by a usual grooved coupling, or by a pair of frontal toothing that couple, head to head, as shown in WO12009/140996 , in EP2042755 , or again in EP2043880 (published also as WO2008/006339 ).
  • the junction area between the wheel hub and the constant velocity joint must be protected from external infiltrations of contaminants (water, dust, mud, dirt); the same applies to the rolling bodies mounted interposed between the inner ring and the outer ring, which is provided with fixing means to an upright of a vehicle suspension.
  • Said protection is obtained according to EP2043880 by means of a single sealing assembly formed by two opposite shields, a first one fixed in axial abutment on the inner ring, on the side facing the constant velocity joint, and a second one fixed within the outer ring and carrying a sealing ring provided with one or more sliding lips, which cooperate in contact with the first shield.
  • the first shield has an axial "leg", or sleeve portion, which extends in a cantilever fashion, with a free end thereof from the inner ring of the bearing defined by the wheel hub assembly towards the outer ring of the constant velocity joint, to cover the junction area.
  • This cantilevered portion may be provided with an annular sealing gasket, which radially cooperates in axial abutment with a shoulder of the outer ring of the constant velocity joint; moreover, the cantilevered portion, or the face of a flange portion, or "radial leg" of the first shield, facing in use the constant velocity joint, may be provided with an annular signal generating element (also called “phonic wheel”), formed, if the shield is made of ferromagnetic metallic material, by an alternation of projections and depressions, or by a seal annular portion made of elastomeric material or of magnetizable plastic base, magnetized so as to have an alternation of magnetized and non-magnetized areas, or of magnetized areas having opposite polarities.
  • the "phonic wheel” which according to what has been said is integral with the inner ring of the bearing, generates a magnetic signal that, in general, is used to detect the rotation speed of the vehicle wheel.
  • the object of the present invention is to provide a sealing device for wheel hub assemblies connected to the constant velocity joints which is free from the drawbacks described above, having low operating costs and high ease of production, high protection efficiency of the rolling elements and of the coupling area between the joint and the wheel hub and reduced overall dimensions both axial and radial, but leaving more space for the sensor, so as to obtain, generated by the sensor, an always strong and reliable magnetic signal accompanied by a significant reduction of the friction generated by the sliding of the sealing ring lips on the first shield, and by a simplified assembly.
  • a sealing device for wheel hub assemblies is provided connected to constant velocity joints, as defined in the appended claims.
  • a sealing device for a wheel hub assembly 3 comprising an inner ring 5, which is operatively associated with a constant velocity joint 6, known and therefore illustrated only schematically for simplicity, to rotate integrally thereto.
  • the wheel hub assembly 3 further comprises an outer ring 8 mounted coaxial and concentric to the ring 5, radially on the outside of the ring 5, and a plurality of rolling bodies 9 interposed between the rings 5 and 8 permitting them to be relatively rotatable about a common symmetry axis A.
  • the inner ring 5 comprises a ring 5b (insert ring or "SIR"), produced as an independent element axially blocked by a rolled edge 7 and externally delimited by a radially outer cylindrical lateral surface 10 ( Figure 2 ), while the constant velocity joint 6 is provided with a radially outer cylindrical lateral surface 11 ( Figure 2 ), substantially coaxial with the ring 5, and with a frontal toothing toothed coupling 12 with the inner ring 5, formed on mutually adjacent portions 13 of the edge 7 and the constant velocity joint 6.
  • ring 5b insert ring or "SIR”
  • the inner ring 5 is provided on the side opposite to the constant velocity joint 6 with a flange 14 for receiving a vehicle wheel, not illustrated for simplicity and the outer ring 8 is adapted to be rigidly connected, in use, with an upright 15 of a vehicle suspension, known and not illustrated for simplicity.
  • the sealing device 1 is intended to be interposed between the inner ring 5 and the outer ring 8 of wheel hub assembly 3, and to extend straddling between the wheel hub 3 and the constant velocity joint 6.
  • the sealing device 1 comprises a first annular shield 16, stationary in use, and a second annular shield 21, rotating in use, adapted to be anchored by means of respective annular journalling sleeve-shaped portions 17 and 22 to the outer ring 8 and to the inner ring 5 of the wheel hub assembly 3 respectively, and having a common symmetry axis coinciding with the symmetry and relative rotation axis A of the rings 5 and 8.
  • the shield 16 has furthermore an annular flange portion 18 which radially extends in cantilever fashion from the journalling portion 17 and towards the shield 21; the shield 21, likewise, has an annular flange portion 23 which radially extends in cantilever fashion from the journalling portion 22 and towards the shield 16, in particular the flange portion 23 extends radially on the outside of the journalling portion 22 and on the side opposite to the flange portion 18; the flange portions 18 and 23 are in particular arranged one in front of the other throughout their radial extension.
  • the flange portion 23 of the second shield 21 carries on the side opposite to the first shield 16 and, in use, towards the constant velocity joint 6 an annular signal generating element 19, also known as impulse ring or phonic wheel, made of a synthetic plastic or magnetizable elastomeric material, which has been magnetized in an alternating way, by means of magnetised and non-magnetised areas, or magnetized with opposite polarity.
  • annular signal generating element 19 also known as impulse ring or phonic wheel, made of a synthetic plastic or magnetizable elastomeric material, which has been magnetized in an alternating way, by means of magnetised and non-magnetised areas, or magnetized with opposite polarity.
  • the annular element 19 is rigidly fixed to a face 20 of the flange portion 23 facing the side opposite to the shield 16, for example the impulse ring 19 is fixed integral to the face 20 by gluing during the curing step.
  • the sealing device 1 further comprises an annular elastomeric sealing element 24 carried integral by the first shield 16, to which has been integrally fixed by gluing during the curing step, and which is provided with a plurality of annular sealing lips 25, 26 and 27.
  • the annular journalling portion 17 of the first shield 16 is intended to fluid-tightly couple, in use, radially on the outside of the outer ring 8 of wheel hub 3 assembly; for this purpose, according to the invention, the flange portion 18 extends in cantilever fashion radially on the inside of the annular journalling portion 17; in particular, the flange portion 18 extends towards the axis A from one end 28 of the journalling portion 17, end 28 which is arranged on the side facing towards the shield 21 and, in use, i.e. in the wheel hub assembly 3 considered as a whole, towards the constant velocity joint 6.
  • the flange portion 23 of the second shield 21 comprises a first, radially external, annular stretch 29 radially opposite to the journalling portion 22, and a second, radially internal, annular stretch 35 immediately adjacent to the journalling portion 22.
  • annular stretch 29 axially extends in cantilever fashion from the annular stretch 35 defining the rest of the flange portion 23, and on the same side of the annular journalling portion 22; in this case, both the annular stretch 29 and the journalling portion 22 axially extend in cantilevered fashion with respect to the flange 23, in particular with respect to the annular stretch 35 thereof, towards the first shield 16.
  • the annular stretch 29 is peripherally external and is incurved radially from the exterior towards the interior and on the side opposite to the first shield 16 to form in radial section a U arranged parallel to the common symmetry axis A of the first annular shield 16 and of the second annular shield 21 and having a concavity 30 thereof facing the side opposite to the first shield 16, to form on the side of the signal generating element 19 and radially on the outside of the signal generating element 19, a curved bottom annular channel 31.
  • the annular stretch 29 is furthermore formed so that a terminal annular edge 32 of the annular stretch 29 of the flange portion 23 is arranged on the side opposite to, and radially flush with, the annular journalling portion 17 of the first shield 16; in other words, the outer diameters of the annular edge 32 and of the sleeve-shaped journalling portion 17 are substantially identical.
  • a curved bottom wall 33 of the annular channel 31 formed by the annular stretch 29 of the flange portion 23 cooperates without contact with the flange portion 18, facing thereto, of the first shield 16 to form with the flange portion 18, in a radial position which is innermost than the radial position of the annular journalling portion 17 of the first shield 16, a first labyrinth seal 34 directed radially, since it is defined by a predetermined and relatively small axial gap present between the radial wall 33 and the flange portion 18, also radially directed.
  • the labyrinth seal 34 radially extends from the end 28 of the journalling portion 17 and up to a radially inner end 36 of the annular stretch 29; the end 36 connects the annular stretch 29 with the rest of the flange portion 23 defined by the annular stretch 35 and forms an axially extending substantially cylindrical sleeve which extends axially towards the shield 16 with respect to the annular stretch 35. Therefore, the curved bottom wall 33 is located much closer to the shield 16 of the annular stretch 35, which is substantially flat.
  • the end 28 is curved and has a curvature substantially opposite to the curvature of the bottom wall 33. Consequently, the labyrinth seal 34 is funnel-shaped radially towards the exterior and therefore, in use, towards the direction of possible entry of external contaminants.
  • the annular lips 25,26 and 27 are formed on the annular sealing element 24 radially in sequence; the annular lip 25 is radially outermost and radially and axially extends in cantilever fashion from the first shield 16 and towards the second shield 21 so as to move obliquely away from the symmetry axis A; moreover the lip 25 is arranged radially on the inside of the annular stretch 29 of the flange portion 23 to form a V-shaped annular channel 37 facing radially towards the exterior and arranged in radial section immediately below the annular stretch 29; the annular channel 37 forms a drip course accessible only through the labyrinth seal 34, since it is arranged within an annular chamber 38 defined between the first shield 16 and the second shield 21.
  • a free end 39 of the annular lip 25 forms with the radially inner end 36 of the annular stretch 29, and inside the annular chamber 38, a second labyrinth seal 40, which is axially directed, i.e. has an extension in the axial direction, and which is directly facing the annular channel 37.
  • the labyrinth seal 40 is defined by a radial gap between the sleeve-shaped end 36 of the annular stretch 29 and an annular flat surface 41 parallel to the symmetry axis A and facing the end 36, which delimits the free end 39 of the annular lip 25; the surface 41 and the end 36 cooperate for the whole extension of the axial surface 41 to form the second labyrinth seal 40.
  • the centrifugation effect on external contaminants (water, dust, mud) caused by the rotation in use of the shield 23 is exalted, by multiplying the same, and the ability of the radially outermost labyrinth seal 34 to counteract the entrance of the contaminants non-centrifuged away from the sealing device 1 is greatly enhanced.
  • the contaminants that may still pass the labyrinth seal 34 are intercepted by the annular channel 37 where they are collected because of the obstacle constituted by the second labyrinth seal 40 and from which can then be easily unloaded by gravity, due to the rotation of the shield 23, through the labyrinth seal 34 thanks to the fact that it is radially directed.
  • the annular journalling sleeve-shaped portion 22 of the shield 23 comprises a first portion defined by a first L-shaped fold 42 which axially extends in cantilever fashion from the flange portion 23 and towards the first shield 16 and a second portion defined by a U-shaped fold 43; the U-shaped fold 43 radially overlaps in contact with the segment defined by the L-shaped fold 41 on the side of the inner ring 5, i.e. radially towards the inside, and extends axially backwards with respect to the L-shaped fold 41, towards the constant velocity joint 6 and beyond the flange portion 23.
  • a third L-shaped fold 44 extends, on the side opposite to the first portion defined by the L-shaped fold 42, integrally formed with the journalling portion 22, in this case with its second portion defined by the third fold 43; the L-shaped fold 44 radially extends towards the inside of the journalling sleeve-shaped portion 22 and is intended to axially extend, in use, in cantilever fashion from the inner ring 5 and, with respect to the flange portion 23, towards the constant velocity joint 6 to form a tubular element 45 coaxial with the inner ring 5 and adapted to be arranged, in use, straddling the wheel hub assembly 3 and the constant velocity joint 6.
  • the L-shaped fold 44 also defines a first axial thrust shoulder for the assembly of the second shield 21 on the radially outer surface 10 of the inner ring 5.
  • the sealing device 1 may comprise a third annular shield 46 intended, in use, for coupling radially towards the inside of the journalling sleeve-shaped portion 22, which in this case is devoid of the U-shaped fold 43 and is constituted only by the L-shaped fold 42 which is coupled with interference with the lateral surface 10;
  • the shield 46 comprises a L-shaped fold 44 radially facing the exterior and the journalling sleeve-shaped portion 22 defined by the fold 42, and a tubular element 45 coaxial with the inner ring 5 and which extends in cantilever fashion from the L-shaped fold 44;
  • the tubular element 45 is adapted to be arranged, in use, straddling the wheel hub assembly 3 and the constant velocity joint 6 and is intended to be journalled onto the inner ring 5, in axial sequence immediately after the second shield 21 and in a direction that moves away from the first shield 16, to axially extend, in use
  • a free end 47 (illustrated as a continuous line for both embodiments) of the tubular element 45, opposite to the L-shaped fold 44, is provided, radially on the inside, of an edge 48 L-folded on the side opposite to a direction of the radial cantilevered extension of the flange portion 23; the L-shaped edge 48 is completely embedded in an annular gasket 49, which cooperates in contact with the lateral surface 11 of the constant velocity joint.
  • journalling portion 17 of the first shield 16 is adapted to be radially coupled on the outside of the outer ring 8 with the interposition of an O-ring 50 arranged radially on the inside of the journalling portion 17 itself.
  • a second annular lip 26 of the annular sealing element 24 is formed on the sealing element 24 radially more inner than the lip 25 and extends axially beyond the free end 39 of the annular lip 25 radially on the inside of the annular lip 25, so as to slidingly cooperate, with axial interference, with the flange portion 23 of the shield 21 in a radial position much closer to the journalling portion 22 of the second shield 21 than the free end 39 of the annular lip 25 .
  • the sealing device 1 described is integrated into the wheel hub assembly 3 and in fact comprises also a stretch of the radially outer lateral surface 10 of the inner ring 5 on which is formed, on the side of the constant velocity joint 6 and at the end 51 of the inner ring facing the constant velocity joint, the annular step 52; the L-shaped fold 44 is accommodated, in both embodiments described, within the annular step 52, arranged axially flush with the signal generating element 19.
  • the annular sealing element 24 also comprises the lip 27, which radially extends in cantilever fashion on the inside of the annular flange portion 18 of the first shield 16, on the side opposite to the annular journalling portion 17 and radially opposite to the annular journalling portion 22 of the second shield 21.
  • the lip 27 cooperates, without contact, in the illustrated example, with the radially outer lateral surface 10 of the inner ring 5 (in this case of the ring 5b); according to an alternative not illustrated for simplicity, the lip 27 can cooperate in contact with the surface 10.
  • a radially outer lateral surface 53 of the outer ring 8, which is engaged by the annular journalling portion 17 of the first shield 16, is provided with an annular seat 54 for accommodating the O-ring 50 arranged radially on the inside of the annular journalling portion 17 of the first shield 16.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Rolling Contact Bearings (AREA)

Claims (10)

  1. Dispositif d'étanchéité (1) pour un ensemble de moyeu de roue (3) connecté à un joint homocinétique (6) et destiné à être interposé entre une bague intérieure (5) et une bague extérieure (8) de l'ensemble de moyeu de roue (3) et à s'étendre avec chevauchement entre le moyeu de roue (3) et le joint homocinétique (6) ; le dispositif d'étanchéité (1) comprenant un premier bouclier annulaire (16), stationnaire pendant l'utilisation, et un deuxième bouclier annulaire (21), rotatif pendant l'utilisation, lesquels sont prévus pour être ancrés, au moyen de portions de tourillon annulaires respectives (17, 22) de ceux-ci en forme de manchon, à la bague extérieure (8) et à la bague intérieure (5) de l'ensemble de moyeux de roue, respectivement, et ayant chacun une portion de bride annulaire respective (18, 23) qui s'étend radialement en porte-à-faux depuis la portion de tourillon et vers l'autre bouclier, et un élément d'étanchéité annulaire (24) porté par le premier bouclier et qui est pourvu d'une pluralité de lèvres d'étanchéité annulaires (25, 26, 27) ; la portion de bride (23) du deuxième bouclier (21) portant, sur le côté opposé au premier bouclier et, pendant l'utilisation, vers le joint homocinétique, un élément de génération de signaux annulaire (19) fabriqué en plastique synthétique ou en matériau élastomère magnétisable, la portion de bride (23) du deuxième bouclier comprenant une première étendue annulaire radialement extérieure (29) opposée à la portion de tourillon (22) du deuxième bouclier, et qui s'étend axialement depuis le même côté de la portion de tourillon annulaire (22) du deuxième bouclier et vers le premier bouclier ;
    une première lèvre annulaire radialement extérieure (25) de l'élément d'étanchéité annulaire (24) s'étendant radialement et axialement en porte-à-faux depuis le premier bouclier (16) et vers le deuxième bouclier (21) de manière à se déplacer obliquement à l'écart de l'axe de symétrie (A), et étant disposée radialement à l'intérieur de la première étendue annulaire (29) de la portion de bride (23) du deuxième bouclier ; et
    une extrémité libre (39) de la première lèvre annulaire (25) formant, avec une extrémité radialement interne (36) de la première étendue annulaire (29) et à l'intérieur d'une chambre annulaire (38) délimitée entre le premier et le deuxième bouclier, un joint à labyrinthe qui est orienté axialement ;
    caractérisé en ce que, en combinaison,
    i) la portion de tourillon annulaire (17) du premier bouclier est destinée à s'accoupler de manière étanche aux fluides, pendant l'utilisation, radialement sur l'extérieur de la bague extérieure (8) de l'ensemble de moyeu de roue ;
    la première étendue annulaire (29) de la portion de bride (23) est incurvée radialement depuis l'extérieur vers l'intérieur et sur le côté opposé au premier bouclier pour former, en section radiale, un U disposé parallèlement à un axe de symétrie commun (A) du premier et du deuxième bouclier annulaire et ayant une concavité (30) faisant face au côté opposé au premier bouclier pour former un canal annulaire inférieur courbe (31) sur le côté de l'élément de génération de signaux (19) ;
    iii) un bord d'extrémité (32) de la première étendue annulaire (29) de la portion de bride (23) du deuxième bouclier étant disposé sur le côté opposé à la portion de tourillon annulaire (17) du bouclier (16), et en affleurement radial avec celle-ci ;
    iv) une paroi inférieure courbe (33) du canal annulaire formée par la première étendue annulaire (29) de la portion de bride du deuxième bouclier coopérant sans contact avec la portion de bride (18) du premier bouclier pour former avec celle-ci, dans une position radiale qui est plus intérieure que la position radiale de la portion de tourillon annulaire (17) du premier bouclier, un premier joint à labyrinthe (34), qui est orienté radialement ;
    v) la première lèvre annulaire radialement externe (25) forme un canal annulaire en forme de V (37) tourné radialement vers l'extérieur et agencé dans la section radiale immédiatement en dessous de la première étendue annulaire (29) de la portion de bride du deuxième bouclier.
  2. Dispositif selon la revendication 1, caractérisé en ce que la portion de tourillon annulaire en forme de manchon (22) du deuxième bouclier comprend une première étendue définie par un premier pli en forme de L (42) qui s'étend axialement en porte-à-faux depuis la portion de bride (23) et vers le premier bouclier (16) et une deuxième étendue définie par un pli en forme de U (43), en chevauchement radial et en contact avec l'étendue définie par le premier pli en forme de L (42) sur le côté de la bague intérieure (5) et qui s'étend axialement vers l'arrière par rapport au premier pli en forme de L (42) vers le joint homocinétique (6) et au-delà de la portion de bride (23) du deuxième bouclier (21).
  3. Dispositif selon la revendication 2, caractérisé en ce qu'un troisième pli en forme de L (44) s'étend à partir du deuxième pli (43), sur le côté opposé à la première étendue définie par le premier pli (42), le troisième pli en forme de L (44) étant réalisé d'une seule pièce avec la deuxième étendue définie par le deuxième pli (43) et s'étendant radialement vers l'intérieur de la portion de tourillon en forme de manchon (22) du deuxième bouclier ; le troisième pli (44) étant prévu pour s'étendre axialement, pendant l'utilisation, en porte-à-faux depuis la bague intérieure (5), et, par rapport à la portion de bride (23) du deuxième bouclier, vers le joint homocinétique (6), pour former un élément tubulaire (45) prévu pour être disposé, pendant l'utilisation, en chevauchement avec l'ensemble de moyeu de roue (3) et avec le joint homocinétique (6), coaxialement à la bague intérieure (5) ; le troisième pli en forme de L (44) définissant un premier épaulement de poussée pour monter le deuxième bouclier (21) (16) sur une surface radialement extérieure (10) de la bague intérieure (5).
  4. Dispositif selon la revendication 2, caractérisé en ce qu'il comprend un troisième bouclier annulaire (46) prévu, pendant l'utilisation, pour s'accoupler radialement vers l'intérieur de la portion de tourillon en forme de manchon (22) du deuxième bouclier, et comprenant : un troisième pli en forme de L (44) tourné radialement vers l'extérieur et vers la portion de tourillon en forme de manchon (22) du deuxième bouclier ; et un élément tubulaire (45) qui s'étend en porte-à-faux depuis le troisième pli en forme de L (44) et qui est prévu pour être disposé, pendant l'utilisation, en chevauchement avec l'ensemble de moyeu de roue (3) et avec le joint homocinétique (6), coaxialement à la bague intérieure (5) et qui est prévu pour être tourillonné sur la bague intérieure, en séquence axiale immédiatement après le deuxième bouclier (21) dans une direction s'écartant du premier bouclier (16), de manière à s'étendre axialement, pendant l'utilisation, en porte-à-faux depuis la bague intérieure (5) vers le joint homocinétique (6) ; le troisième pli en forme de L (44) définissant un premier épaulement de poussée pour monter le troisième bouclier (46) à l'intérieur d'un épaulement annulaire (52) d'une extrémité (51) de la bague intérieure.
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce qu'une extrémité libre (47) de l'élément tubulaire est pourvue, radialement sur l'intérieur de celui-ci, d'un bord en forme de L (48) sur le côté opposé à une direction d'extension radiale en porte-à-faux de la portion de bride (23) du deuxième bouclier (21) ; le bord en forme de L (48) de l'extrémité libre de l'élément tubulaire étant entièrement encastré dans une garniture annulaire (49).
  6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la portion de tourillon (17) du premier bouclier est prévue pour être accouplée radialement sur l'extérieur de la bague extérieure (8) en interposant un joint torique (50) qui est disposé radialement sur l'intérieur de la portion de tourillon du premier bouclier.
  7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une extrémité libre (39) de la première lèvre annulaire (25) est délimitée par une surface annulaire plate (41) qui est parallèle à l'axe de symétrie (A) et qui fait face à l'extrémité radialement interne (36) de la première étendue annulaire (29), avec laquelle elle coopère pour former le joint à labyrinthe (40) orienté axialement.
  8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément d'étanchéité annulaire (24) comprend une deuxième lèvre annulaire (26) qui s'étend axialement en porte-à-faux au-delà de l'extrémité libre (39) de la première lèvre annulaire (25) et radialement sur l'intérieur de la première lèvre annulaire de manière à coopérer par coulissement avec la portion de bride (23) du deuxième bouclier dans une position radiale qui est beaucoup plus proche de la portion de tourillon (22) du deuxième bouclier que de l'extrémité libre (39) de la première lèvre annulaire.
  9. Ensemble de moyeu de roue (3) connecté à un joint homocinétique (6), caractérisé en ce qu'il comprend un dispositif d'étanchéité (1) selon l'une quelconque des revendications précédentes, le dispositif d'étanchéité (1) comprenant en outre une étendue d'une surface latérale radialement extérieure (10) de la bague intérieure (59) sur laquelle est réalisé un épaulement annulaire (52) sur le côté du joint homocinétique (6) et à une extrémité (51) de la bague intérieure faisant face au joint homocinétique ; le troisième pli en forme de L (44) étant reçu à l'intérieur de l'épaulement annulaire (52) et étant disposé axialement en affleurement avec l'élément de génération de signaux (19).
  10. Ensemble de moyeux de roue (3) selon la revendication 9, caractérisé en ce que l'élément d'étanchéité annulaire (1) comprend une troisième lèvre (27) qui s'étend radialement en porte-à-faux sur l'intérieur de la portion de bride annulaire (18) du premier bouclier, sur le côté opposé à la portion de tourillon annulaire (17) du premier bouclier et radialement devant la portion de tourillon annulaire (22) du deuxième bouclier, pour coopérer avec la surface latérale radialement extérieure (10) de la bague intérieure ; une surface latérale radialement extérieure (53) de la bague extérieure (8), qui est en prise avec la portion de tourillon annulaire (17) du premier bouclier, étant pourvue d'un siège de réception annulaire (54) pour le joint torique (50) disposé radialement sur l'intérieur de la portion de tourillon annulaire (17) du premier bouclier.
EP15191531.1A 2014-11-28 2015-10-26 Dispositif d'étanchéité avec un codeur pour un ensemble de roulement d'un moyeu de roue relié à un joint homocinétique Active EP3026282B1 (fr)

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CN113653738B (zh) * 2021-07-26 2023-06-20 人本股份有限公司 磁性密封的抗冲击轮毂轴承

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